Instructions
Watch for Birdo's snout to enlarge slightly. This means it is about to shoot out a projectile--either a fireball or an egg.
Dodge the fireballs that Birdo shoots out of its snout.
Jump on the eggs that come out of the snout, and press "B" on the NES controller or "2" on the Wii remote to grab the egg.
Run toward Birdo and throw the egg back at it with the "B" or "2" button to hit your foe. Do this three times to defeat Birdo.